/Engine/Source/Runtime/Engine/Public/ParticleEmitterInstances.h
Get the lifetime and size for a particle being added to the given trail
void GetParticleLifetimeAndSize ( int32 InTrailIdx, const [FBaseParticle](API\Runtime\Engine\FBaseParticle) * InParticle, bool bInNoLivingParticles, float & OutOneOverMaxLifetime, float & OutSize )